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Cited by 263

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Infrared and terahertz studies of polar phonons and magnetodielectric effect in multiferroicBiFeO3ceramics

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Kamba, S., Nuzhnyy, D., Savinov, M., Šebek, J., Petzelt, J., Prokleška, J., Haumont, R., Kreisel, J.·2007·Physical Review B

Abstract

$\mathrm{Bi}\mathrm{Fe}{\mathrm{O}}_{3}$ ceramics were investigated by means of infrared reflectivity and time domain terahertz transmission spectroscopy at temperatures $20--950\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, and the magnetodielectric effect was studied at $10--300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ with the magnetic field up to $9\phantom{\rule{0.3em}{0ex}}\mathrm{T}$. Below $175\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, the sum of polar phonon contributions to the permittivity corresponds to the value of measured permittivity below $1\phantom{\rule{0.3em}{0ex}}\mathrm{MHz}$. At higher temperatures, a giant low-frequency permittivity was observed, obviously due to the enhanced conductivity and possible Maxwell-Wagner contribution. Above $200\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ the observed magnetodielectric effect is caused essentially through the combination of magnetoresistance and the Maxwell-Wagner effect, as recently predicted by Catalan [Appl. Phys. Lett. 88, 102902 (2006)]. Since the magnetodielectric effect does not occur due to a coupling of polarization and magnetization as expected in magnetoferroelectrics, we call it an improper magnetodielectric effect. Below $175\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ the magnetodielectric effect is by several orders of magnitude lower due to the decreased conductivity. Several phonons exhibit gradual softening with increasing temperature, which explains the previously observed high-frequency permittivity increase on heating. The observed noncomplete phonon softening seems to be the consequence of the first-order nature of the ferroelectric transition.

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Metadata

Authors
Kamba, S., Nuzhnyy, D., Savinov, M., Šebek, J., Petzelt, J., Prokleška, J., Haumont, R., & Kreisel, J.
Venue
Physical Review B
Published
2007-01-03
Volume
75
Issue
2
ISSN
  • 1098-0121 (ISSN-L)
  • 1550-235X
OpenAlex
W2249847489
Cited by
263
References
15
FWCI
11.54
Type
journal article
Language
en
Open access
green

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